大跨软岩公路隧道围岩稳定性分析

本文针对大跨度软岩隧道的围岩变形特点,以集呼高速公路旗下营隧道右线出口段YK197+040断面在CD法施工下围岩变形的现场监测数据为背景,整理了拱顶沉降的位移-时间曲线,探讨了拱顶沉降随开挖时间的变化情况。运用ABAQUS软件,结合实际隧道工艺建立了三维有限元模型,数值分析了隧道开挖后拱顶及周边位移的变化趋势,研究了围岩力学性能参数对隧道变形以及围岩稳定性的影响。在综合考虑监测数据与数值结果的基础上,为后续隧道安全施工提供了有益的理论建议。

Stability Analysis on the Surrounding Rock of Large Span Highway Tunnel in Soft Rock

This paper is focused on the research of surrounding rock deformation characteristics of soft rock tunnel with large span. Based on the site monitoring data of surrounding rock deformation of the right line section YK197+040 of Qixiaying tunnel located in Ji-Hu highway project and excavated with CD construction method, the displacement-time curve of tunnel crown settlement is presented in this paper, and the variation of crown settlement with excavation time is investigated. Using ABAQUS finite element software and considering the construction method, a three-dimensional model is established to numerically simulate the tunnel crown settlement and the surrounding displacement. The effect of mechanical parameters of surrounding rock on the tunnel deformation and surrounding rock stability is also numerically studied. Based on the result of site monitoring data and numerical result, a rational theoretical recommendation to secure the following tunnel excavation is presented in this paper.